How to extract a specific information from a file

Question

Ibrahim Tariq Javed 2020-7-9

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/562166-how-to-extract-a-specific-information-from-a-file

评论： madhan ravi 2020-7-9

Hello all,

I have a large file containing data like this

INFO [07-05|15:18:04.004] 🔨 mined potential block number=1078 hash="f6d5bd…58bea5"

INFO [07-05|15:18:04.004] Commit new mining work number=1079 sealhash="e686b6…bceb85" uncles=0 txs=0 gas=0 fees=0 elapsed="508.656µs"

INFO [07-05|15:18:06.004] Successfully sealed new block number=1079 sealhash="e686b6…bceb85" hash="b624ff…c743ae" elapsed=1.999s

INFO [07-05|15:18:06.004] 🔗 block reached canonical chain number=1072 hash="92fe2f…fc6bf1"

INFO [07-05|15:18:06.004] 🔨 mined potential block number=1079 hash="b624ff…c743ae"

INFO [07-05|15:18:06.004] Commit new mining work number=1080 sealhash="c2f151…17e0b6" uncles=0 txs=0 gas=0 fees=0 elapsed="515.946µs"

INFO [07-05|15:18:08.001] Successfully sealed new block number=1080 sealhash="c2f151…17e0b6" hash="f65eab…94b932" elapsed=1.996s

INFO [07-05|15:18:08.001] 🔗 block reached canonical chain number=1073 hash="702dde…1fcf2a"

INFO [07-05|15:18:08.001] 🔨 mined potential block number=1080 hash="f65eab…94b932"

INFO [07-05|15:18:08.002] Commit new mining work number=1081 sealhash="daee7d…2444ae" uncles=0 txs=0 gas=0 fees=0 elapsed="545.658µs"

INFO [07-05|15:18:10.004] Successfully sealed new block number=1081 sealhash="daee7d…2444ae" hash="baf0f0…68ffa6" elapsed=2.002s

INFO [07-05|15:18:26.000] Successfully sealed new block number=1089 sealhash="d645c1…1ed93b" hash="883415…4510e6" elapsed=1.995s

INFO [07-05|15:18:26.000] 🔗 block reached canonical chain number=1082 hash="67aa36…b89cd1"

INFO [07-05|15:18:26.000] 🔨 mined potential block number=1089 hash="883415…4510e6"

I want to extract the information elasped (the one in s and not in µs). I have underlined it

Can somebody help me. Thanks alot

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Answer 1

Apoorv Singh 2020-7-9

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/562166-how-to-extract-a-specific-information-from-a-file#answer_463379

copy the whole text to a string. Then search for the keywork "elapsed". Consider the substring from this index till the end of each entry. Once you have this substring, you can further impose the condition that only values in seconds have to be considered.

This seems more like a hack than a nice solution, but I hope this helps :)